Apply go fix modernizations

receiver.go

@@ -9,7 +9,7 @@ import (
 
 type Receiver struct {
 	conn    *multicast.Conn
-	handler func(src *net.UDPAddr, pkt interface{})
+	handler func(src *net.UDPAddr, pkt any)
 	done    chan struct{}
 }
 
@@ -60,7 +60,7 @@ func NewDiscoveryReceiver(iface *net.Interface) (*Receiver, error) {
 	}, nil
 }
 
-func (r *Receiver) SetHandler(fn func(src *net.UDPAddr, pkt interface{})) {
+func (r *Receiver) SetHandler(fn func(src *net.UDPAddr, pkt any)) {
 	r.handler = fn
 }